Control system for wideband recording and reproducing systems

Claim 2

A SERVO SYSTEM FOR CONTROLLING THE OPERATION OF A MOVING MEMBER IN DIFFERENT MODES, INCLUDING THE COMBINATION OF SERVO MEANS HAVING A SELECTED SERVO BANDWIDTH FOR DRIVING THE MOVING MEMBER IN SYNCHRONISM WITH A TIME STABLE REFERENCE DURING OPERATION IN A FIRST MODE, MEANS PROVIDING A TIMING SIGNAL REPRESENTATIVE OF ACTUAL SPEED VARIATIONS IN THE MOVING MEMBER DURING OPERATION IN THE FIRST MODE, AND MEANS COUPLED TO RECEIVE THE TIMING SIGNAL, FOR MODIFYING THE OPERATION OF THE SERVO MEANS TO PROVIDE A NORMALLY SUBSTANTIALLY NARROWER SERVO BANDWIDTH DURING OPERATION IN A SECOND MODE.

Claim 3

IN A MAGNETIC TAPE RECORDING AND REPRODUCING SYSTEM FOR TELEVISION PROGRAM MATERIAL, WHICH SYSTEM INCLUDES A PAIR OF SCANNING HEADS ON A CYCLICALLY OPERATING HEAD DRUM THAT ALTERNATELY SCAN THE TAPE HELICALLY TO RECORD OR REPRODUCE SUCCESSIVE TELEVISION FIELDS, THE COMBINATION COMPRISING: CONTROL TRACK RECORDING AND REPRODUCING MEANS DISPOSED IN OPERATIVE RELATION TO A LONGITUDINAL TRACK ON THE TAPE; HEAD TACHOMETER SIGNAL GENERATOR MEANS COUPLED TO THE SCANNING HEADS AND PROVIDING AT LEAST A PAIR OF SUCCESSIVE CONTROL SIGNALS TO DENOTE SELECTED STARTING POINTS IN THE HEAD DRUM CYCLES; MEANS COUPLED TO THE SIGNAL GENERATOR MEANS FOR PROVIDING TACHOMETER CONTROL SIGNALS WHICH DENOTE HEAD DRUM STARTING POINTS BY SELECTED PHASE COMPONENTS OF THE TACHOMETER CONTROL SIGNAL; ADJUSTABLE DELAY MEANS COUPLED TO RECEIVE THE TACHOMETER CONTROL SIGNALS; MEANS COUPLING THE TACHOMETER CONTROL SIGNALS TO THE CONTROL TRACK RECORDING AND REPRODUCING MEANS DURING OPERATION IN THE RECORD MODE; MEANS PROVIDING TIME STABLE REFERENCE PULSES; SERVO COMPARATOR MEANS INCLUDING A PAIR OF INPUT TERMINALS AND PROVIDING A SERVO ERROR SIGNAL AS OUTPUT; MEANS COUPLING THE STABLE REFERENCE PULSES AND THE TACHOMETER CONTROL SIGNALS TO THE SERVO COMPARATOR MEANS DURING OPERATION IN THE RECORD MODE; MEANS COUPLING THE TACHOMETER CONTROL SIGNALS AND REPRODUCED CONTROL SIGNALS AND REPRODUCED CONTROL SIGNALS FROM THE CONTROL TRACK RECORDING AND REPRODUCING MEANS DURING OPERATION IN THE REPRODUCE MODE; COMPENSATION NETWORK MEANS RECEIVING THE SERVO ERROR SIGNAL AND PROVIDING A VARIABLE SIGNAL DEPENDENT UPON THE LEVEL OF THE SERVO ERROR SIGNAL; MEANS COUPLED TO SAID SERVO COMPARATOR MEANS AND RESPONSIVE TO ONE OF THE SEQUENCES OF SIGNALS PROVIDED THERETO FOR CLAMPING THE SERVO ERROR SIGNAL AT A SELECTED NOMINAL LEVEL IN THE ABSENCE OF SIGNALS IN THE SEQUENCES APPLIED THERETO; MEANS COUPLED TO THE COMPENSATION NETWORK MEANS FOR PROVIDING A SQUARE WAVE MOTOR DRIVE SIGNAL; AN INDUCTION MOTOR COUPLED TO RECEIVE THE MOTOR DRIVE SIGNAL AND TO ROTATE IN RESPONSE THERETO; AND MECHANICAL COMPLIANCE MEANS COUPLING THE MOTOR TO THE HEAD DRUM.

Claim 4

IN A MAGNETIC TAPE RECORDING AND REPRODUCING SYSTEM FOR TELEVISION PROGRAM MATERIAL, WHICH SYSTEM INCLUDES A PAIR OF SCANNING HEADS ON A CYCLICALLY OPERATING HEAD DRUM THAT ALTERNATELY SCAN THE TAPE HELICALLY TO RECORD OR REPRODUCE SUCCESSIVE TELEVISION FIELDS, THE COMBINATION COMPRISING: CONTROL TRACK RECORDING AND REPRODUCING MEANS DISPOSED IN OPERATIVE RELATION TO A LONGITUDINAL TRACK ON THE TAPE; HEAD TACHOMETER SIGNAL GENERATOR MEANS COUPLED TO THE SCANNING HEADS AND PROVIDING AT LEAST A PAIR OF SUCCESSIVE CONTROL SIGNALS TO DENOTE SELECTED STARTING POINTS IN THE HEAD DRUM CYCLES; MEANS COUPLED TO THE SIGNAL GENERATOR MEANS FOR PROVIDING TACHOMETER CONTROL SIGNALS WHICH DENOTE HEAD DRUM STARTING POINTS BY SELECTED PHASE COMPONENTS OF THE TACHOMETER CONTROL SIGNAL; ADJUSTABLE DELAY MEANS COUPLED TO RECEIVE THE TACHOMETER CONTROL SIGNALS; MEANS COUPLING THE TACHOMETER CONTROL SIGNALS TO THE CONTROL TRACK RECORDING AND REPRODUCING MEANS DURING OPERATION IN THE RECORD MODE; MEANS PROVIDING TIME STABLE REFERENCE PULSES; SERVO COMPARATOR MEANS INCLUDING A PAIR OF INPUT TERMINALS AND PROVIDING A SERVO ERROR SIGNAL AS OUTPUT; MEANS COUPLING THE STABLE REFERENCE PULSES AND THE TACHOMETER CONTROL SIGNALS TO THE SERVO COMPARATOR MEANS DURING OPERATION IN THE RECORD MODE; MEANS COUPLING THE TACHOMETER CONTROL SIGNALS AND REPRODUCED CONTROL SIGNALS AND REPRODUCED CONTROL SIGNALS FROM THE CONTROL TRACK RECORDING AND REPRODUCING MEANS DURING OPERATION IN THE REPRODUCE MODE; COMPENSATION NETWORK MEANS RECEIVING THE SERVO ERROR SIGNAL AND PROVIDING A VARIABLE SIGNAL DEPENDENT UPON THE LEVEL OF THE SERVO ERROR SIGNAL; MEANS COUPLED TO SAID SERVO COMPARATOR MEANS AND RESPONSIVE TO ONE OF THE SEQUENCES OF SIGNALS PROVIDED THERETO FOR CLAMPING THE SERVO ERROR SIGNAL AT A SELECTED NOMINAL LEVEL IN THE ABSENCE OF SIGNALS IN THE SEQUENCES APPLIED THERETO; MEANS COUPLED TO THE COMPENSATION NETWORK MEANS FOR PROVIDING A SQUARE WAVE MOTOR DRIVE SIGNAL; AN INDUCTION MOTOR COUPLED TO RECEIVE THE MOTOR DRIVE SIGNAL AND TO ROTATE IN RESPONSE THERETO; AND MECHANICAL COMPLIANCE MEANS COUPLING THE MOTOR TO THE HEAD DRUM.